The series is about a young boy named Hiori who leads a double life as the mysterious thief known as "Pokémon 7". Pokémon 7, along with his trusty partner Lucario, retrieves stolen objects from other thieves and returns them to their rightful owners.

During the day, Hiori works at the bread shop "Sun Sun". He poses as a mild mannered boy with limited battling ability, purposely hiding his Lucario's fighting power and his strategic ability, defending himself by saying he hates battling. His co-worker, Nazuna, has fallen in love with Pokémon 7, but doesn't think highly of Hiori. The series seems to deal with Pokémon 7's various encounters with criminals while Hiori tries desperately to keep his secret identity safe from Mako, a magazine reporter eager to uncover Pokémon 7's true identity. However, the story quickly develops into a conflict between Hiori, his self-proclaimed rivalRocco, and Team Galactic, in order to rescue Hiori's kidnapped twin sister, Lily.

The series appears to follow the conventions of various other Kaitou stories which feature daring and stylish criminals who steal from other criminals, such as Magic Kaito and Saint Tail.

Publication

The first half of the series was released as one collected volume. The second half remains unreleased in a collected volume, only ever being published in MaruMaru Comic.